Chain stitch sewing machine



March 1934- N. v. CHRISTENSEN ET AL 1,952,534

CHAIN STITCH SEWING MACHINE v Filed Feb. 1. 1952 s Sheets-Sheet I I3nnentor S g; J M 1/ 62 0/6754 65 a.

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attornegs CHAIN STITCH SEWING MACHINE Filed Feb. 1. 1932 3 Sheets-Sheet.2

WW YR attorneys March 1934- N. v. CHRISTENSEN El Al. 1,952,534

CHAIN STITCH SEWING MACHINE Filed Feb. 1952 3 Sheets-Sheet 3 ZiqnentorS(Ittorneg Patented Mar. 27, 1934 UNITED STATES PATENT OFFICE:

CHAIN STITCH SEWING MACHINE Illinois Application February 1, 1932,Serial No. 590,228

3 Claims.

The invention relates to new and useful improvements in a sewingmachine, and more particularly to a sewing machine for producing chainstitches at the edge portion of the fabric for hemming, binding orsimilar stitching.

An object of the invention is to provide a sewing machine of the abovetype wherein the needle is reciprocated, the looper given its looptaking and needle avoiding movements, and the feed dog given its fabricengaging and feeding movements, all from a single operating shaftarranged above the work support and positively connected by links andoscillated members to the parts actuated thereby.

A further object of the invention is to provide a machine of the abovetype wherein the main actuating shaft is disposed so as to extend in thegeneral direction of the line of feed so that the connections betweenthe actuating shaft and the parts operated thereby may be reduced innumber and simplified.

These and other objects will in part be obvious and will in part behereinafter more fully disclosed.

In the drawings which show by way of illustration one embodiment of theinvention:-

Figure 1 is a view taken from the end of the machine and in a directionat right angles to the feed, the cover plates for the actuating partsbeing removed and parts being broken away so as to show the innerstructure of the machine;

. Fig. 2 is a view partly in section andpartly in plan of the oscillatedparts beneath the work support;

Fig. 3 is a view partly in front elevation and partly in verticalsection at right angles to the line of feed and at the stitching point,showing the looper, the means for supporting the same and for impartingloop taking movements thereto.

The present invention has to do with the type of machine shown anddescribed in the patent granted Norman V. Christensen and Frederick F.Zeier, March 25, 1930, No. 1,751,508. The machine embodying theinvention produces a straight line of chain stitches through the cooperation of a needle and a thread carrying looper which has a loop takingand a needle avoiding motion. The needle and the looper are actuatedfrom a main shaft located above the work support and extending in thegeneral direction of the line of feed. Said shaft is carried by astandard which 'is mounted on the bed and located at one side of theline of feed, and preferably in rear of the stitching point. Thisstandard carries supporting bearings for the main shaft. The

main shaft is preferably inclined at an acute angle to the line of feedso as to better position the shaft for the actuation of the partsbeneath the work support. There is an eccentric member on the shaftconnected to the needle bar for reciprocating the same. There is aneccentric on the shaft connected to an oscillating member beneath thework support which imparts the loop a taking movements to the looper.There is also an eccentric on the shaft connected to oscillating partsbeneath the work support which gives to the looper its needle avoidingmovement. There is an eccentric on the shaft which gives the fabricengaging movements to the feed dog, and another eccentric on the mainshaft which gives the oscillating movements to the feed rocker. Theseeccentrics are all carried on the shaft between supporting bearingslocated adjacent the ends of the shaft, and the links and oscillating'members for imparting these movements to the looper and feed dog arefew in number and of simple stood by a more detail description of theillustrated embodiment thereof. In the drawings, the

machine is shown as including a supporting bed 1 carrying brackets onwhich the work support 2 is mounted. Also mounted on the bed 1 is astandard 3 which is located at one side of the work support and extendsto a position above the work support. Said standard is provided with anoverhanging portion 3 carrying bearings for the main actuating shaftindicated at 4. A needle bar 5 carrying the needle 6 is mounted forreciprocation in a sleeve '7 which is rigidly attached to the bracketarm 8 formed as a part of this overhanging portion 3 The sleeve 7extends only a slight distance above the bracket arm 8 and the needlebar 5 projects above the end of the sleeve. Mounted on the upper end ofthe needle bar is a collar 9 carrying a pin to which a link 11 isconnected. This link 11 at its lower end is connected to a crank carriedby a disk 13 which is fixed to the end of the shaft 4. This crankconstitutes an eccentric member which imparts, through the link 11,reciprocations to the needle bar.

Cooperating with-the needle beneath the work support is a looper 14.This looper 14 is mounted in a looper carrier 15 which is pivoted at 16to a depending bracket 17 of the looper support 18. The looper support18 is provided with trunnions 19 and 20 which are in axial alinement,and these trunnions are mounted in bearings carried til by a bracket 21which is carried by the bed of the machine. It is noted that thetrunnion 19 has the center thereof substantially in a line containingthe path of reciprocation of the needle, as clearly shown in Fig. 1 ofthe drawings. The axis of the shaft 4 is not only inclined to the lineof feed, but is also inclined to the plane of the work support. Theneedle bar reciprocates in a plane which is cut at right angles by theaxis of the shaft 4, and therefore, the needle path is in a lineinclined to the plane of the work support.

The looper carrier 15 is oscillated for giving to the looper its looptaking movements by means of a link 22. Said link is pivoted at 23 tothe looper carrier, and at its other end is pivoted at 24 to an arm 25carried by ashaft 26 mounted in suitable hearings in the bed of themachine. On this shaft 26 is a collar 27 carrying an arm provided with aball stud 28 (see Figures 2 and 3). Mounted on the main shaft 4 is aneccentric 29. An eccentric strap 39 cooperates with the eccentric 29,and this eccentric strap is connected to the ball stud 28. As the mainshaft rotates, the eccentric strap 30 will oscillate the shaft 26, andthe shaft 26, through the link 22 will osciliate the looper, moving thesame into and out of the needle thread loop. The looper is provided withan eye 14 at the point thereof, also an eye 14 at the heel thereof, anda looper thread Z is directed to the eyes of the looper so that thelooper cooperates with the needle in the formation of locked chainstitches.

The looper support 18 has an arm 31 attached thereto. This arm carries aball stud 32. On the main shaft 4 is an eccentric with which theeccentric strap 33 cooperates. This eccentric strap at its lower end isattached to the ball stud 32. Thus it is that the eccentric strap 33 isdirectly connected to the arm 31 which is rigidly attached tothe loopersupport 18. By the mechanism just described, the looper is given itsloop taking movements through an eccentric strap or link which isdirectly connected to the looper, and is given its needle avoidingmovements through an eccentric strap or link and an intermediateoscillated part. All the movements imparted to the looper are of apositive character, and the actuating mechanism is very simple and offew parts, notwithstanding that the actuating shaft is above the worksupport, while the looper is beneath the work support.

Cooperating with the needle beneath the work support is a guard orneedle guide 34 adjustably connected to an arm 35 which is attached tothe bracket 21 by suitable bolts 36. The needle guard is secured to the35 by screws 3'7, 37, passing through slots in the arm. The needle guard34 is inclined so as to be substantially parallel with the path of theneedle and may be adjusted vertically to bring said guard into propercooperation with the needle.

The material is fed across the work support 2 by a feed dog 38. Thisfeed dog is carried by a feed bar 39 which is pivoted at 40 to a feedrocker 41. The feed rocker carries arm 44. On the main shaft 4 is aneccentric 43. An eccentric strap cooperates therewith and is attached toa ball stud 46 attached to the arm 44. Said ball stud is shiftable in aslot 4? in the arm so that the extent of oscillation imparted to therock shaft may be varied. This provides a means for directly oscillatingthe rock shaft from the eccen- --tric'-strap cooperating with aneccentric on the main shaft which is above the work support. Thiseccentric is substantially directly over the connection to the arm onthe rock shaft, and this is one of the purposes of extending the mainactuating shaft in the general direction of the line of feed. It alsoenables the eccentrics for the other actuated parts to be placed moredirectly over the parts to which they are connected.

The feed dog is raised and lowered by an eccen-- tric 48 on the mainshaft 4. Cooperating with this eccentric is an eccentric strap 49 whichis connected to a ball stud 50 on an arm 51 pivoted at 52 to the frameof the machine. pivoted also to the stud 50 carrying the ball with whichthe eccentric strap 49 cooperates. This link 53 is pivoted at its lowerend to the feed bar and raises and lowers the feed dog 38. When it isdesired to impart a differential feeding movement to the fabric, anauxiliary feed dog is used which is pivotally supported on the feed barand is controlled in its movements by a shiftable arm 54. The feedingmechanism described in detail is similar to that of the Christensen andZeier patent above referred to.

The fabric is held on the work support by a presser foot 55 which isattached to an arm 56 rigidly attached to a shaft 57 mounted in bearingsin the frame of the machine. A rod 58 extends into the overhangingportion 3 of the bracket, and is spring-pressed against the arm 56 foryieldingly holding the presser foot in engagement with the fabric. Thetension on the spring is controlled by a lLnurl-headed bolt 59.

Mounted in the standard 3 of the machine is a bracket 69 which issecured to the standard by bolts 61, 61 passing through slots in thebracket and threaded into the standard. This bracket may be raised andlowered and is for the. purpose of supporting attachments to be used inguiding and directing the fabric, and is particularly adapted forsupporting an English binder, which directs the binding about the edgeof the fabric. This binder and the supporting means therefor has notbeen shown in detail in this application, but is shown, described andclaimed in the application of George Sauer, Serial No. 590,277, filed ofeven date herewith.

The needle thread is indicated at n in the drawings. The control for theneedle thread and the looper thread includes movable devices carried bythe link which re'ciprocates the needle bar. This thread controllingmechanism forms no part of the present invention, but is shown,described and claimed in an application filed by Charles F. Rubel,Serial No. 603,291, filed April 5, 1932.

While a single needle machine is shown, it will be understood that aplurality of needles may be used with a cooperating looper for eachneedle, or with a looper cooperating with more than one needle. It willalso be understood that other forms of stitching mechanism may be usedin the machine described, but the invention is directed particularly toa machine wherein there is a thread carrying looper having both a looptaking and a needle avoiding movement, and wherein all of the actuatingparts of the machine are operated directly from a main actuating shaftlocated above the work support. While the shaft is shown as inclined tothe plane of the work support, and the needle moving in a path inclinedto said plane, it will be understood that from certain aspects of theinvention, the needle may be set so as to move in a vertical path. It isessential, however, that the main actuating shaft shall extend in thegeneral direction of the line of feed so as to facilitate the directoperation of A link 53 is the parts beneath the work support from saidshaft.

It is obvious that minor changes in the details of construction may bemade without departing from the spirit of the invention as set forth inthe appended claims.

Having thus described the invention, what We claim as new and desire tosecure by Letters-Patent, is-

l. The combination of a supporting bed, a work support carried thereby,a standard carried by the bed and disposed at one side of the worksupport, an actuating shaft located above the plane of the Work supportand disposed so as to extend in the general direction of the line offeed and located substantially in rear of the stitching point, a needle,means for operating said needle from said actuating shaft, a threadcarrying looper cooperating with said needle beneath the work support, acarrier on which said looper is mounted, a loo-per support on which saidcarrier is pivoted, means operated by said actuating shaft and directlyconnected to said looper support for oscillating the same and giving tothe looper a needle avoiding movement, a shaft located beneath the worksupport, means for connecting said shaft to the looper carrier formoving the looper into and out of the needle thread loop, and meansactuated by said actuating shaft and directly connected to the shaftbeneath the work support for oscillating the same.

2. The combination of a supporting bed, a work support carried thereby,a standard carried by the bed and disposed at one side of the worksupport, an actuating shaft located above the plane of the work supportand disposed so as to extend in the general direction of the line offeed and located substantially in rear of the stitching point, spacedbearings carried by the standard in which said shaft is mounted, areciprocating needle bar carried by the standard, a needle carriedthereby, an actuating member carried by said shaft and connected to saidneedle bar for reciprocating the same, a looper support mounted beneaththe work support for oscillation about an axis at right angles to theline of feed, a looper carrier pivoted to said looper support foroscillations about an axis substantially parallel with the line of feed,a looper mounted on said carrier, means actuated by said shaft anddirectly connected to said looper support for oscillating the same andgiving to the looper a needle avoiding movement, and means operated bysaid shaft and connected to said looper carrier for moving the looperinto and out of the needle thread loop.

3. The combination of a supporting bed, a work support carried thereby,a standard carried by the bed and disposed at one side of the worksupport, an actuating shaft located above the plane of the work supportand disposed so as to extend in the general direction of the line offeed and located substantially in rear of the stitching point, spacedbearings carried by the standard in which said shaft is mounted, areciprocating needle bar carried by the standard, a needle carriedthereby, an actuating member carried by said shaft and connected to saidneedle bar for reciprocating the same, a thread carrying looper locatedbeneath the work support and cooperating with said needle, a support forsaid looper, an actuating member carried by the shaft, a linkcooperating therewith and directly connected to said support foroscillating the same, a second actuating member carried by said shaft, alink cooperating therewith, an oscillating part to which said last-namedlink is connected, and a link connecting said oscillating part to thelooper for giving to the looper its loop taking movements.

NORMAN V. CHRISTENSEN.

FREDERICK F. ZEIER.

